Unreal Engine Issues

UE-242406

Each bone scales are improperly applied in the physical animation

Each bone scales are improperly applied in the physical animation

EPS
Description

Suggested fix from licensee is :

PhysAnim.cpp@339
#if 0
	FVector RelPos = RecipScale3D * RelTM.GetLocation();
#else
	FVector RelPos = (BoneIndex == 0) ? RecipScale3D * RelTM.GetLocation() : RecipScale3D / InOutComponentSpaceTransforms[GetSkeletalMeshAsset()->GetRefSkeleton().GetParentIndex(BoneIndex)].GetScale3D() * RelTM.GetLocation();
#endif
Steps to Reproduce
  • Download the repro project in the URL
  • Launch the project
  • Open /All/Game/Characters/Mannequins/Meshes/SKM_Manny_Big_PhysicsAsset
  • Press Simulate button on the menu bar

Result:
Scale is doubly applied to bones below the bone with scale

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Backlogged
ComponentUE - Simulation - Visual
Affects Versions5.5
CreatedFeb 4, 2025
UpdatedOct 8, 2025
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